public static Goal Distincto(this KRunner k, params object[] vs)
{
if (vs.Length < 2)
{
return(k.Succeed);
}
if (vs.Length == 2)
{
return(k.Noto(k.Eq(vs[0], vs[1])));
}
var gs = Enumerable.Empty <Goal>().ToList();
for (var i = 0; i < vs.Length; ++i)
{
for (var j = i + 1; j < vs.Length; ++j)
{
gs.Add(k.Noto(k.Eq(vs[i], vs[j])));
}
}
return(k.All(gs.ToArray()));
}
public static Goal Noto(this KRunner k, params Goal[] gs)
{
if (gs.Length == 0)
{
return(k.Succeed);
}
if (gs.Length == 1)
{
return(k.If(gs[0], k.Fail, k.Succeed));
}
return(k.All(gs.Select(g => k.Noto(g)).ToArray()));
}